The Research Laboratory of Solid State Physics was established at the Department of Physics in 2002. The laboratory operates on a voluntary basis. The Head of the Department of Physics, Candidate of Physical and Mathematical Sciences, Associate Professor Y. Ivashyna was appointed as the head of the laboratory. Since 2018, the laboratory has been headed by Candidate of Physical and Mathematical Sciences, Associate Professor Ivashyna Yu. K. The laboratory cooperates with the Institute for Problems of Materials Science of the National Academy of Sciences of Ukraine.
MAIN RESEARCH DIRECTIONS:
- 1.
Study of the interaction of hydrogen atoms with crystal structure defects in metals.
- 2.
Influence of internal stresses and structural defects on the segregation of the hydride phase in Me-H systems.
- 3.
Study of the physical properties of higher borides of rare-earth metals.
The laboratory has developed research methods and manufactured installations for introducing hydrogen into metal, studying temperature dependencies of electro- and thermophysical properties of materials, coefficients of thermo-EMF and linear expansion.
Unique Setup: A unique setup for studying the amplitude dependence of internal friction on plate-shaped samples has been developed, manufactured, and commissioned in the laboratory. The setup allows for semi-automatic measurement of the logarithmic decrement of sample oscillation damping at relative strain amplitudes from 10-6 to 10-3. To prevent acoustic losses, a vacuum of the order of 10-4 mm Hg is created in the measuring cell.
The sample oscillations, using an inductive sensor, modulate the oscillation frequency of a high-frequency (about 3.8 MHz) generator. After the frequency detector, an electrical signal is formed, proportional to the sample's deviation from the zero level. A programmable amplifier with 24 fixed coefficients allows the signal amplitude to be brought to the standard level of a two-threshold amplitude discriminator. Internal friction is determined by counting the number of oscillations between the set amplitude levels. The ratio of the upper and lower thresholds of the amplitude discriminator is usually 1.2. The measurement results are processed on a computer in real-time, graphically displayed on the screen, allowing for operational experiment control. After the completion of the next series of measurements, the obtained data is saved to a file suitable for import into Excel spreadsheets for further analysis and publication.
Using this setup, successful studies are conducted on the formation and characteristics of hydrogen nanosegregations on dislocations in groups IV and V metals.
In recent years, the state budget topic "Study of physical properties, influence of deformations on hydrogen solubility, binding of its atoms with dislocations in Me-H(D) systems" has been successfully executed in the laboratory.
Educational Activities: Students of specialty 014 Secondary Education (Physics) perform term papers and graduation theses and conduct scientific research based on the laboratory.
📂 Laboratory Report for 2019